72377503765121 has 4 divisors (see below), whose sum is σ = 74142808735044. Its totient is φ = 70612198795200.

The previous prime is 72377503765117. The next prime is 72377503765153. The reversal of 72377503765121 is 12156730577327.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9804657675121 + 62572846090000 = 3131239^2 + 7910300^2 .

It is a cyclic number.

It is not a de Polignac number, because 72377503765121 - 2² = 72377503765117 is a prime.

It is a super-2 number, since 2×72377503765121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72377503965121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 882652484900 + ... + 882652484981.

It is an arithmetic number, because the mean of its divisors is an integer number (18535702183761).

Almost surely, 2^{72377503765121} is an apocalyptic number.

It is an amenable number.

72377503765121 is a deficient number, since it is larger than the sum of its proper divisors (1765304969923).

72377503765121 is a wasteful number, since it uses less digits than its factorization.

72377503765121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765304969922.

The product of its (nonzero) digits is 12965400, while the sum is 56.

The spelling of 72377503765121 in words is "seventy-two trillion, three hundred seventy-seven billion, five hundred three million, seven hundred sixty-five thousand, one hundred twenty-one".